Rss Feeds: Parsing Numerical Data

Programming Questions

kayleb24

Rss Feeds: Parsing Numerical Data

in Programming Questions • 9 months ago

I'm working with an edit of "Till Nagel's SimpleFeedVisualizer" trying to gather numerical data from : http://www.newyorkfed.org/xml/data/ff/ffd.xml <base: OBS_VALUE> XMLElement. Unfortunately I have some poor understanding of the code. I'm trying to gather numerical data from a string a variable so e.g. String s; and parse int values into a variable e.g. int I = Integer.parseInt(s); I'm not clear on the where I should be declaring these statements, and if at there's is any need to edit the section loading RSS Feeds.

/**
* Loads RSS feed and visualizes the titles in a very simple manner.
* Color and bar depend on the length of the corresponding title.
*
* (c) 2008 Till Nagel, btk.tillnagel.com
*/
//import processing.xml.*;
// Array to store titles
String[] titles;
PFont font;
void setup() {
size(700, 300);
background(0);
noStroke();
// Setup font
font = loadFont("Calibri-12.vlw");
textFont(font, 12);
// Load RSS feed
String url = "http://www.newyorkfed.org/xml/data/ff/ffd.xml";
XMLElement rss = new XMLElement(this, url);
// Get data of each element
XMLElement[] dataXMLElements = rss.getChildren("ff: Obs/base: OBS_VALUE");
numbers = new String[dataXMLElements.length];
for (int i = 0; i < dataXMLElements.length; i++) {
String s = dataXMLElements[i].getContent();
int I = Integer.parseInt(s);
// Store data in array for later use
numbers[i] = data;
}
}
void draw() {
background(255);
// Draw all titles with bars and colors depending on its length
for (int i = 0; i < numbers.length; i++) {
float y = (i+1) * 15;
fill(255 - constrain(numbers[i].length(), 0, 255));
rect(8, y - 11, 14, 14);
fill(127, 100);
rect(23, y - 11, numbers[i].length() * 2, 14);
fill(0, 220);
text(numbers[i], 26, y);
}
}

Replies(2)

Chrisir

Re: Rss Feeds: Parsing Numerical Data

8 months ago

this at least gives you some output, but I don't know how to parse the thing further...

// see http://processing.org/reference/XML.html
// see https://forum.processing.org/topic/rss-feeds-parsing-numerical-data
/**
based on
*
* Loads RSS feed and visualizes the titles in a very simple manner.
* Color and bar depend on the length of the corresponding title.
*
* (c) 2008 Till Nagel, btk.tillnagel.com
*/
//import processing.xml.*;
// Array to store titles
String[] titles;
// this must be global // should have a better name since it is a String
String [] numbers;
float [] numbers2;
PFont font;
void setup() {
size(900, 800);
background(0);
noStroke();
// Setup font
font = createFont("Calibri-12.vlw", 13);
textFont(font, 12);
// Load RSS feed
String url = "http://www.newyorkfed.org/xml/data/ff/ffd.xml";
// XML rss = new XML (this, url);
//
// new
XML rss = loadXML(url);
//
// println (rss);
// Get data of each element
// XML[] dataXMLElements = rss.getChildren("ff: Obs/base: OBS_VALUE");
//
XML[] dataXMLElementsHelper = rss.getChildren("ff:DataSet");
XML[] dataXMLElements = dataXMLElementsHelper[0].getChildren();
//
numbers = new String[dataXMLElements.length];
numbers2 = new float [dataXMLElements.length];
println("=============================================");
print("Length: ");
println(dataXMLElements.length);
println(numbers.length);
println("=============================================");
for (int i = 0; i < dataXMLElements.length; i++) {
String s = dataXMLElements[i].getContent();
// int I = Integer.parseInt(s);
// Store data in array for later use
numbers[i] = s; // data;
if (isNumericFloatString(s))
numbers2[i] = float ( s ) ; // data;
println(s);
//
}
//
println();
println("=============================================");
println();
// println(numbers);
//
} // func
void draw() {
// exit();
background(255);
// Draw all titles with bars and colors depending on its length
for (int i = 0; i < numbers.length; i++) {
float y = (i+1) * 15;
fill(255 - constrain(numbers2[i], 0, 255));
rect(8, y - 11, 14, 14);
//
fill(127, 100);
fill(255, 0, 0);
rect(23, y - 11, numbers2[i] * 2, 14);
rect(i*10, height-30-numbers2[i]*200, 7, height-30 );
fill(0, 220);
text(numbers[i], 26, y);
}
}
// -----------------------------------------------------------
// func
boolean isNumericFloatString( String wordMy ) {
//
// boolean Buffer = true;
//
for (int i = 0; i < wordMy.length(); i++) {
if ((wordMy.charAt(i) >='0' && wordMy.charAt(i) <= '9') || wordMy.charAt(i) == '.' )
{
// is numeric
}
else
{
// any wrong occurance: return immediately
return false;
} // else
} // for
return true;
//
} // func
//

kayleb24

Re: Rss Feeds: Parsing Numerical Data

8 months ago

Hi,

Apologise on the late response to this. I appreciate your help on the matter. After reviewing my code I ended up using a shorthand method, to test errors in my code. I removed the graphic elements of my code. My new code displays the int values gathered from XMLElements. I missed that I was gathering float values and trying to convert them to numerics via int.parseInt() My new edit includes some omissions from my previous code, and is a result of consulting with third parties on shorthand methods to my previous approach.

N.B. there are some null feedback errors that seem to be a result of sensor node data receivers from the RSS feed.

/**
* Loads RSS feed and visualizes the titles in a very simple manner.
* Color and bar depend on the length of the corresponding title.
*
* (c) 2008 Till Nagel, btk.tillnagel.com
*/
//import processing.xml.*;
// Array to store titles
float[] speeds;
PFont font;
void setup() {
size(700, 300);
background(0);
noStroke();
// Setup font
font = loadFont("Calibri-12.vlw");
textFont(font, 12);
// Load RSS feed
String url = "https://www.massdot.state.ma.us/feeds/traveltimes/traveldata.aspx";
XMLElement rss = new XMLElement(this, url);
// Get speed
XMLElement[] titleXMLElements = rss.getChildren("TRAVELDATA/PAIRDATA/Speed");
speeds = new float[titleXMLElements.length];
for (int i = 0; i < titleXMLElements.length; i++) {
//Get speed value as a string
String speed = titleXMLElements[i].getContent();
// Convert to Integer and store in array for later use
try{
speeds[i] = Float.parseFloat(speed);
}catch(NullPointerException npe){
print("caught a null!");
}
print(""+speeds[i]);
println(" "+speed);
}
}
void draw() {
background(255);
// Draw text
for (int i = 0; i < speeds.length; i++) {
float y = (i+1) * 15;
fill(0, 220);
text(speeds[i], 26, y);
}
}

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